bicycle You can change default search engine on vanadium, I did it to startpage.com
It is explained by startpage.com how to do it.
But I agree regarding Bitwarden.
Also, in my case, I still use firefox because Vanadium private mode can't be streamed with adb scrcpy tool.
Window is hidden. And I prefer to navigate with private mode on firefox than standard mode on vanadium because of screenshare issue.